Hello guys ! I'm always training myself in Voronoi fracture with Houdini. Now I have another problem ^^"

I have a mesh with a shell, and the Voronoi fracture understand that. But not with all pieces. I have weird inside mesh added in a few pieces and I don't know why
I tweak the random seed in Voronoi fracture points sop but I always have one or two piece with weird inside polygons




Thanks :p

http://forums.odforce.net/topic/22286-voronoi-fracture-weird-inside-polygons/?p=132669 [forums.odforce.net]

Have a same problem and tried solutions from link. Any other ideas?